6 papers · 1 filter
Gravimetry enhanced by nonreciprocal optomechanical coupling
Dong Xie, Chunling Xu
We explore how to measure the gravitational acceleration by using a dissipative optomechanical cavity. What is quite different from the conventional measurement methods is that we…
Dispersive Qubit Readout of Temperature
Dong Xie, Chunling Xu
Squeezed light can exponentially increase the signal-to-noise ratio (SNR) of dispersive qubit readout, especially using a combination of injected external squeezing (IES) and intra…
Parameter estimation and quantum entanglement in PT symmetrical cavity magnonics system
Dong Xie, Chunling Xu, An min Wang
We investigate the parameter estimation in a magnon-cavity-magnon coupled system. PT symmetrical two magnons system can be formed in the gain magnetic materials by the adiabatic el…
Enhancing parameter estimation precision in dissipative environment with two-photon driving
Dong Xie, Chunling Xu
We investigate the frequency estimation of an optical field suffering from an unavoidable dissipative environment. Generally, dissipative noises greatly reduce the precision. Here,…
Multi-parameter Quantum Magnetometry with Spin States in coarsened measurement reference
Dong Xie, Chunling Xu
We investigate the simultaneous estimation of the intensity and the orientation of a magnetic field by the multi-parameter quantum Fisher information matrix. A general expression i…
Enhancing precision of damping rate by PT symmetric Hamiltonian
Dong Xie, Chunling Xu
We utilize quantum Fisher information to investigate the damping parameter precision of a dissipative qubit. PT symmetric non-Hermitian Hamiltonian is used to enhance the parameter…